Oracle Internals

From: Henry Poras <Henry.Poras_at_ctp.com>
Date: Tue, 13 Mar 2001 19:18:51 -0800
Message-ID: <F001.002CBC1F.20010313192520@fatcity.com>

I have been rereading Steve Adam's book a bit more carefully and have a question. Just wondering if anyone has any answers.

When talking about latch sleeps, the book states "a process sleeping for a latch waits on its semaphore". However, latches don't support queuing and a number of processes may be waiting for the same latch. If I am sleeping and the latch frees, who knows I need that semaphore? Are all waiting processes posted with the semaphores going on/off/on/off? or is no semaphore posted and the processes go sleep/wake/check/sleep/wake/check? I can't quite picture the details here.

Henry

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Author: Henry Poras
INET: Henry.Poras_at_ctp.com

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